Siebel HI Framework for IE

I am getting this error on application start up, and after that
application gets closed.

Error:

Version of the Siebel High Interactivity Framework for IE,
required for use of this Siebel application, may not be current.
In order to download a current version of the Siebel high
Interactivity Framework, please ensure that your browser
security settings are correct and then log in to the application
again. Consult your system administrator for details about the
Siebel High Interactivity Framework and correct browser
settings.

This is the error I am getting. i guess i need to set security
settings to install activeX. I am running Siebel 7.8.4 and IE6
on medium security level. I can not set security level lower
than medium. I can go for custom. Please help me to set security
level.